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Lesson 2 Competition

Lesson 2 Competition. By the end of this lesson you should be able to:. explain, with examples, the terms interspecific and intraspecific competition. Relationships.

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Lesson 2 Competition

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  1. Lesson 2Competition

  2. By the end of this lesson you should be able to: • explain, with examples, the terms interspecificand intraspecificcompetition.

  3. Relationships Different relationships exist between organisms in communities and these relationships can affect the size of a population and its distribution. • Relationships that exist between organisms include the following: • competition • predator/prey • mutualism • commensalism • parasitism • disease The effect of a particular relationship may depend on the density of the population, for example, disease or parasites spread rapidly when a population’s density is high.

  4. The ecological niche

  5. Intra-specific competition • Occurs between organisms of the same species. • Slows down population growth as less well-adapted individuals will die or reproduce less. • The population will enter the stationary phase of the growth curve.

  6. Interspecific competition • Interspecificcompetition: competition between different species • Competitive Exclusion Principle: no two species can occupy the same niche. Paramecium aureliawill out-compete P. caudatumfor food when grown together.

  7. Results of interspecific competition between 2 species of Flour Beetle. In competitions between two species of flour beetles, Triboliumcastaneum (prefers hot- wet conditions) and T. confusum, the results in competition vary according to temperature and humidity.

  8. competitive exclusion and resource partitioning

  9. Resource Partitioning - species with niche overlap, share/partition resources.

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